Typewriting machine



Jilly 29, 1941- M. H. MANN 2,251,147v

TYPEWRITING MACHINE 4 Filed D80. 15, 1938 v 10 Sheets-Sheet l INVENTORMILES H. MANN TORNEY July 29, 1941. M. H. MANN TYPEWRITING MACHINE FiledDec. 15, 1938 10 She et s-Sheet 2 July 29, 1941. M. H. MANN TYPEWRITINGMACHINE Filed Dec. 15, 1.95s

10 Sheets-sheaf. s

New m2 INVENTOR M LES H. MANN July 29, 1941. M. H. MANN TYPEWRITINGMACHINE Filed Dec. 15, 1938 10,. Sheets-Sheet 4 INVENTOR M ILES HMANN BYTTORNEY mun xmum E. W. M

July 29, 1941. M. H. MANN TYPEWRITING MACHINE Filed Dec. 15, 1938 10Sheets-Sheet 5 INVENTOR MILES I-l. MANN W TTORNEY y 9, 1941. M. H. MANN2,251,147

TYPEWRITING momma Filed Dec. 15, 193a '10 Sheets-Sheet e INVENTOR M ILESH. MANN TORNEY vb QQSN N July 29, 1941. M. H. MANN TYPEWRITING MACHINEFiled Dec. 15, 1938 10 Sheets-Sheet 7 miiii I July 29, 1941. M. H. MANNTYPEWRITING MACHINE Filed Dec. 15, 1958 10 Sheets-Sheet 8 INVENTOR MILESl-l. MANN W TORNEY July 29, 1941. M H MANN 2,251,147

TYPEWRITING MACHINE Filed Dec. 15, 1938 10 Sheets-Sheet 9 INVENTORATTORNEY 98 BtI HLES H. MANN Patented 29,1941 v to Underwood ElliottFisher, Company,

New

iork, N. Y., a corporation of Delaware Application December-.15, 1938,Serial No. 245,941

(cl. 197-66) Figure 2 illustrates a detail of a mechanism This inventionrelates to machines and more particularly .to mechanism for quicklyconveying workforms into and out of typing position. The typing mayproceed, for a succession of torms, on a continuous work web conveyedpast the printing line by means of a paper roller or feeder.

An object of the invention is to provide an efllcient power drivenmechanism operatable, after typing a form, for imparting to the paperroller or feeder a movement or sweep'oi. comparativeiy large extent soas to bring the firstline-place of a succeeding form immediately intotyping position.

Another object is to apply such mechanism to a paper roller whichconstitutes a-revoluble platen in a typing machine, and it is a furtherobject to arrange the mechanism so that a carriage mounting therevoluble platen or paper roller may ordinarily move in letter'i'eed andreturn directions.

A motor mechanism for returning the carriage may be of the kind showninPatent No. 1,835,776

to W. F. Helmond, dated December 8, 1931; in, which a normally inactivemotor becomes opera tive to return the carriage merely through startingthe motor as by' means of a switch.

It is anobjectof the invention to employ such motor mechanism for alsooperating the form feeding mechanism, and it is a further object toprovide means whereby the start of the motor for a form feedingoperation is prevented from returning the carriage. I

Another object is to provide means for blocking overthrow: of the paperroller by the form feeding mechanism and to have the paper rollernormally free of such means so that the latter do not interfere withordinary rotation or line spacing of the paper roller.

Another object is to provide at the keyboard of a typewriter employingthe form feeding mechuard;

Figure 3 is a perspective of the platen carriage including itsportionoi' theforin-feeding mech- 1 details of anism.

Figure 4 is a perspective spreadof some of the parts of the form-feedingmech- Figure 5 is a cross sectional side view of the a machine from theleft.

Figure 6 is a cross sectional side view showing the relative position ofparts at one stage of the form-feeding cycle. 2

Figure '7 is a side elevation showing the relaa tive position of partsat another stage of the form-feeding cycle. Figure 8 is a top plan viewof the motor transmission and form-feeding mechanism.

Figure 9 is a perspective illustrating details of a spring coupling inthe motor transmission.

Figure 10 is aperspective of line spacing mech-x I I anism;

Figure 11 is a cross sectional view on the trace ll-l'l of Figure 12. I

Figure 12 is a side view of the transmission mechanism as disposed inthe machine.

Figure 13 is a view partly in section of parts parts'being shown brokenaway and sectioned.

for clearness.

Figure 15 is a perspective of the paper-overf throw-preventing means atone stage 01 operation.

Figure 16 is a perspective showing another stage in the operation of theoverthrow preventing means.

Figure 17 is. a sectional side viewof the machine including the carriagereturn mechanism in normal position.

Figure 18 is a side view showing the parts of the carriage returnmechanism in operated positions. a Y

Figure 19 is a perspective, partly sectioned, of a modified springcoupling.

Figure 20 is a sectional view of the Figure 19 coupling.

A continuous work web 25, presenting a succession of telephone toll billforms 26, severable on lines 24, Figure 3, is feedable lengthwise bymeans of a platen or paper roll 21 and cooperative pressure rolls 28,Figure 1. The platen 21 part at one side of is revolubly supported in acarriage comprising a frame 2! having rollers SI and lugs 3i, engaging,respectively, front and rear tracks 81, I! mounted on side members 34,SI of the ma chine framework.

A platen axle it is iournaled in carriage and plates 81 suitablysupported by the platen frame It. A tubular sleeve Il may be fixed tothe platen axle it by set screws ll, Figure 3, and the platen may befixed to said sleeve II by set screws 40 in a platen hub 4 I.

A web guiding chute, Figure 3, comprises an upwardly and rearwardlyinclined floor I! at the intake side of the platen and web-edge-guidingsides I through which the platen extends.

A tie rod 44 connecting the carriage end plates 81 may support arms, notshown. for the pressure rolls II as exemplified in Patent No. 1,392,940to W. F. Helmond, dated October 11,1921.

A letter-feed rack ll on the carriage frame II, escapement l6, and aspring drum 41, Figure 17, cooperate to advance the carriage inletter-feeding direction at operation of the type-bars ll, Figure 3, totype on the work web 2!.

Each telephone toll bill 28 is typed to list a subscriber's calls inindividual lines a, Figure 3, of the bill. After each typing of a line,the platen may be line-spaced and the carriage returned by power to aline-start position by means of the following mechanism.

An electric motor ll is suitably supported at the left back corner ofthe typewriter frame II, as in Figure 8, and presents transversely ahoriaontal drive shaft II.

A carriage return key lever I2 fulcrumed on the typewriter frame ismanually rockable from the normal position, Figure 17, to the Figure 18position to engage a pawl ll of a trip link I to lift and release thelatter from latching engagement, as at I, Figure 17, with a cross plate50 supported by the framework. The trip link I4 is pivoted at ii to anarm ll fixed to a transverse rock shaft 59 Journaled in brackets I on across member '2 of the framework. Another arm ll fixed to said rockshaft II has a pin and slot pivotal connection 84 to a bar 6! adapted asat Cl to control a spring pressed contact 11. In the normal position ofthe parts, Figure 17, said bar I! keeps said contact '1 separated from acompanion contact I. Upon release of the trip link II, a spring 8 movesthe latter rearwardly to the Figure 18 position thereby rocking theshaft 50 and moving the bar I rearwardly, counter to the pull of aspring II, to cause the contacts '1, I to close to close a suitablecircuit to start the motor, the motor being. normally inactive.

The motor shaft ii is connected by a spring coupling ll, Figure 8, to aninput shaft I! of a worm and worm wheel gearing I3 in a housing 14mounted at the back of the typewriter frame ll. An output shaft 15 ofsaid gearing has a clutch-toothed carriage-retum pinion 1'' shiftabletherealong into and out of engagement with a clutch collar 71 on saidshaft 75. The pinion It has a groove II for a shifter arm I! fixed to arock shaft 80 journaled in brackets ii, 02, Figures 5, 17, of thehousing I4. An arm 83, in itself rotatably loose on said rock shaft II,is normally held by a spring 84 against a pin 85 of an arm 88 rigidlyfixed to said rock shaft 80, the latter and said arm I! being thusyleldably connected. Thepinion "mesheswitha rackl'l onthecarrises.

in tbe'arm ss au rotatable bykthe shaft 11 of the motor train through afriction coupling comprising a shoulclose, the motor II is started andhence drives the shaft II clockwise of Figure 17 through the springcoupling II. The cam-arm it initially rotates with said shaft I! to rockthe arm .3

counter-clockwise from the Figure 17 position to the Figure 1s positionin which said arm at catches a notch ll of the cam-arm II and blocksfurther rotation of the latter, while the shaft It continues rotating asis provided for by said friction coupling. The arm ll working throughthe spring I rocks the shaft OI to move the pinion ll rearwardly intoclutch with the clutch collar 11 of the motor driven train. In theresulting rotation of the pinion II, the rack I! is limitedly movablerightwardly, relatively to the carriage, upon brackets ll of thecarriage. This movement of the rack 81 relatively to the carriage linespaces the platen by means of the mechanism shown at Figure 10. saidmechanism may be as shown in the aforesaid Helmond Patent No. 1,835,776and, briefly described, includes a linespace pawl-carrying slide II andan operating connection it therefrom to the rack 81. The platen axle ithas a toothed line space wheel I! engageable by a pawl II on said slide.A spring pressed detent lever I, normally engages said wheel '1.

Due to the inertia of the carriage, the motor driven rack l1 movesendwise relatively thereto, for line spacing, usually before said rackpicks up the carriage to return it to line start position.

A carriage return limiting margin stop 9! stationed on cross rods Ill,Ill, supported in the frame side-members 34, II, cooperates with acounter-stop ill on the carriage. As said counter-stop it! reaches saidmarginstop II, a tappet m on the returning carriage will have engaged adog I" splined to the cross rod II! and will thereby have rocked saidrod I02 counter-clockwise of Figure 17. The rod Ill, thus rocked, worksthrough linkage II! to rock the shaft 88 counter-clockwise of Figure 18to restore the trip link .54, and to effect retraction of the bar it aby spring I. to open the switch contacts II, ll. The motor II is therebydeenergized while the spring coupling Ii is under a twist as thecarriage is arrested by means of the margin stop ll. As the springcoupling 1| resiliently untwists again upon final stoppage of thedeenergired motor, it turns the motor reversely and the motor in itsreverse turning will acquire sumcient momentum to rotate the input shaftI2 reversely. This reverse rotation of the input shaft I2 is sufllcientto turn the cam-arm ll reversely, from the Figure 18 to the Figure 17position, to release the arm 83 to cause the pinionlt to be shiftedforwardly, and thus unclutched from the clutch collar 11, by means of aspring Ill, Figure 17.

The carriage return mechanism thus far described operates substantiallyas set forth in the aforesaid Helmond Patent No. 1,835,776.

It may be explained at this point that, for a purpose of the inventionto be explainedlater, clutchingofthepinlonlttotheclutchcoliar .IIbyvmeans of, the cam-arm I! shaft 33. Said arm I33 is in itselfrotatably looseon the rock shaft "and is caused to be with-' drawn,- by.means of an arm II2 rigidly fastened to said rockshaft 53. as the latteris rocked when the trip link 54 istripped. The restoration of the rockshaft 53 slightly precedes, in point of time, the unclutching "of thepinion 16 and restoration of the arm III. For this reason a spring II3yieldably connects the arms I08, II2, so that the arm II2 may berestored while the arm I06, as in Figure 18, rests on top of the tabIIO. Normally the arm I03 abuts a pin II4 of thearmII2asinFigure6. I

The web 25 is initially positioned around the platen 21 so that. theiirst-line-place of a bill 26 isat the printing line. The number oflines a typed-on each bill varies. of course, according to the number ofcalls that are to be included in the bill. One bill may have only oneline, another two lines, another three lines, and so on up to thecall-line capacity of the bill. Thus, for each bill 26 the platen 21will be rotated a number of line spacing steps according to the numberof lines typed on the bill. After typing the last line of a bill, thecarriage may be returned to line start position and the platen may oncemore be line spaced inasmuch as a line spacing operation accompanies areturn movement of the carriage. Then the platen is to be rotated in onesweep to advance the web to such extent that the flrst-line-place of thesucceeding form 26 is brought into typing position.

I will now describe the mechanism, and its association with previouslydescribed features, for thus advancing succeeding forms 26 of the web 25into typing position.

The platen 21 may be of such diameter or circumference that one completerevolution thereof will advance the web 25 an extent equal to theover-all length of one form 26, or, in other words, an extent equal tothe distance between the first-line places of two consecutive forms 26.

A gear I20 may be power driven by means of the motor 50 in cycles of onecomplete revolution each and may be mounted on and at the right side ofthe machine frame 35 for meshing with a platen driving gear I2I that initself is rotatably loose on the platen axle 36.

Therefore, the transverve motor driven shaft 12, Figure 8, is extendedfor driving a countershaft I22 that extends forwardly along and near theright side of the machine frame member 35, said shafts 12, I22 beingconnected by helical gears I23. A rear section I24, Figure 12, of saidcounter-shaft I22 has one of the helical gears I23 fixed thereto and isjournaled in a housing I25 supported by a plate I26 extending from thehub gear being fastened together asby normally positioned so that an armI41 of said rivets I33. A plate I43 Is rigidly fastened to the inner endof said stub shaft I31 by means of flats I on said inner end, and shutand washer fastening I42. Said plate I40 has pivoted thereto a clutchpawl I43 that under the urge of a spring I44 anchored to said plate I40at I45 tends to move into engagement with clutch teeth I46 formed at theend of the .worm wheel hub The gear I20, and hence the plate I40, are

f pawl I43 abuts the top of a clutch tripping arm I43 rigidly'fastenedto a. clutch tripping rock shaft I43 journaled in the housing I30. Saidpawl I43 thus abutting said clutch tripping arm I48 is normally held bythe latter out of engagement with the clutch teeth I46 of the worm gearI33 as in Figure 5. I

The counter-shaft sections I24, I29 may be connected by means of aremovable shaft section I50 and shaft-section interlocking keys I5I,Figure 12. Sleeves I52 for holding the intermediate shaft section I50 inplace are themselves kept in place, against the housings I25, I30 by anintermediate spring I53, and it will be obvious that said sleeves I62may be moved endwise for removing or replacing the intermediate shaftsection I60.

A form-feeding cycle or single revolution of the gear I20 by means ofthe motor 50 is caused upon depressing a form-feeding key I56 dis- Saidkey I66 is on a key-lever I51 fulcrumed at I58 in the framework crossmember 62. An upright link I53 is pivoted to said key lever at I60 andhas at its upper end ahook I6I Inormally over a lateral tab I62 of alever I63 fixed to the clutch tripping rock shaft I 49. A spring I64attached to said lever I63 normally keeps the latter and the clutchtripping arm I48 in normal positions. Figure 5, in which said arm I48abuts a stop I65 in the housing I30. Upon depressing the key lever I51,the hook I6I is drawn downwardly to rock the lever I63, and arm I48,clockwise of Figure 5 to release the clutch pawl I43 ,which thereupon,urged by its spring I44, moves housing 14. The other helical gear I23 isfixed Y to the extension of shaft 12 which may also be ,Iournaled insaid housing I25. A shaft covering tube I21 may bridge the housings 14,-I25, Figure 3. A forward section I20 of the counter-shaft I22 isiournaled in a housing I30 secured by screws I3I, Figure 12, to theright machine frame toward the clutch teeth I46. As the lever I63 isthus rocked, another arm I66 thereof raises a link I61 to rock a lever,comprising arms I68, I63 joined by a yoke I10, counter-clockwise about afulcrum stud III on the right hand bracket 60, said link I61 beingconnected to the arm I66.

As the arm I60 is thus rocked, a step I12 thereon is withdrawn from alateral tab I13 of an arm I 14 rigidly fastened to a transverse rockshaft I15 Journaied in the brackets 60. Thereupon, a spring I16 pullingon said arm I14 tends to rock said shaft I15 clockwise until the tab I13abuts another step I11 of the arm I63 as in Figure 6. The rock shaft I15when fully rocked operates, through an arm I13 fixed thereon, to engagea stud I80 of the switch control bar 65 to move the latter rearwardly tocause the switch contacts 61, 63 to close to start the normally inactivemotor 50.

It further results from the depression of the 6 form feeding key leverI51 that a link 'I6I, pivotaily connected thereto and having apin-andslot connection I32 to an arm I63 fixed to the carriage returnclutch controlling rock shaft 60, is pulled down. Said rock shaft 60 isthus prevented from being rotated accidentally to close the carriagereturn clutch 16, 11 while the form feed key lever I51 is depressed. Thekey lever I51 is kept depressed until the end of the formfeeding cycleof the gear I28. Therefore, said key lever I51 may have an arm I84connected by a link I85 to an arm I88 that in itself is rotatably looseon the shaft I15. As said key lever I51 is fully depressed, said linkI85 moves forwardly and a latch hook I81 on a rearward extension of thesp ing pressed arm I14 moves up--- wardly, as said arm I14 fully dropsto the step I11, for catching a lateral tab I88 of said link I85, as inFigure 6. to latch the key lever I51 in its depressed position. Theparts may be timed so that the full drop of the arm I14 to the step I11and hence the closing of the motor switch 81, 88 do not occur until saidtab I88 has been moved sufficiently forward by the key lever I51 topermit the latch hook I81 to rise fully behind said tab I88. For thispurpose, the top of the latch hook I81 normally is slightly below thebottom of the tab I 88, and upon depression of the key lever I51, thestep I12 moves from under the tab I13 of the arm I14 and said arm I14drops partly toward the step I11 before the tab I88 has moved forwardlysufficiently to clear said latch hook I81.

At the rotation of the motor 58 resulting from depressing the key leverI51 to the Figure 6 position, the cam-arm 88 will, of course, be rotatedand the arm 88 will be rocked to the Figure 6 position. But rocking ofthe shaft 88 and closing of the carriage return clutch 18. 11 areblocked by the depressed key lever I51, through the link I'8I and armI88, and in that case the spring 84 that operatively connects theactuated arm 88 to said rock shaft 88 will merely yield. There is also ablock, against closing the carriage return clutch 18, 11, through thearms I88, III, as at Figure 6, because the carriage-return-keyactuatableshaft 58, and its said arm I88, are not rocked at depression of theform-feeding key lever I51. The arm I18 of the-rock shaft I is enabledto move the switch control bar 85 rear-- wardly, independently of thecarriage-returnkeyea'ctuatable rock shaft 58, by reason of thepin-and-slot connection 84. The key-lever I51 may have an arm I 88 tooppose a lateral stud I88 in the arm II2 on said shaft 58 to keep thelatter in normal position when said key lever is depressed as in Figure6.

The clutch-trip-link I58, from the form-feed key lever I51, works in ahorizontal slotted guide I88 attached to the framework. A spring I'8Ifrom said guide I88 to said link I58 urges the latter to turncounter-clockwise about its pivot I88. so that in the normal position ofthe parts, Figure 5, said link I58 abuts a stop I82 in an arm I88supported by the framework. Said spring I8I cooperates with anotherspring I84 to keep the key lever I51 normally against the top of a keylever guide slot I85 in the cross plate 58. As said link I58 is drawndownwardly by said key lever I51, a cam I88 thereon encounters a studI81 on the arm I83 to cause said link I58 to be rocked clockwise aboutits pivot I88 thereby causing the tab I82 of the concomitantly rockedclutch tripping lever I88 to escape from the link hook I8I as indicatedat I88, Figure 6. By the time 'the link I51 is fully depressed as inFigure 6, its cam I88, meeting stud I81 will have served to move thehookI8I well away from said tab I82. This leaves the clutch-trip arm I48free to return to its normal position, against the stop I85, for endingthe cycle of revolution of the gear I28 as will become apparent.

A full stroke devicemay be associated with the key lever I51 and may beof the kind shown in Pitman Patent No. 1,955,606, dated April 17,

1934. Briefly described, said full stroke device I includes a rod 288pivotally pendent from the arm I88 and having teeth 28I cooperative witha pawl 282 pivoted to the key yever I51 to prevent return of said ke'ylever I51 once the latter in its down-stroke has reached the point, say,where the clutch-trip-arm I48 is withdrawn from the pawl-clutch-arm I41.Said pawl 282 encounters a cam 288 on the rod 288 near the end of thedown-stroke of the key lever I51 and the pawl is thereby thrown to theFigure 6 position, clear of the teeth 28I. The cam 288 operates to throwthe pawl 282 back to the tooth engaging position on the up-stroke of thekey lever I51. A spring pressed detent 284 on the key lever cooperatesto place the pawl 282 ineither position.

Pivoted to the framework on a vertical axis as at 288, Figures 1, 5 and8, is a lever 281 having a forward stop end 288 for a shoulder 288 ofthe link I58. When the carriage is in fully returned position, a lug 2IIon the carriage rod 44, engaging an upright tab 2I2 of said lever 281,keeps the latter in such position that the stop end 288 is withdrawnfrom under the shoulder as in Figure 8. At the first step of thecarriage, in letter-feed direction, from its fully returned position,the carriage lug 2II recedes from said tab 2I2 and therefore a spring2I8 turns said lever 281 counter-clockwise about its pivot 288, Figure8, to a stop 2I4 to interpose the stop end 288 under the shoulder 288,and in this position, said stop end 288, resting on the horizontal guideI88, serves to stop downward movement of the link I58 and therebyprevent depression of the form-feed key lever I51 if the carriage hasbeen advanced a letter-feed step or has been moved from its fullyreturned position.

With the carriage in its fully returned position, the form-feed keylever I51 may be depressed and it will be apparent now that a start ofthe cycle of revolution of the gear I28 will result inasmuch as thedepression of the key lever has operated to cause the clutch pawl I48 toclose on the worm wheel clutch teeth I48 by withdrawing the clutch triparm I48, and to close the motor switch contact 81, 88. As the gear I28nears the end of its cycle of revolution, a pin 2I5 therein encounters acam nosed arm 2I8 of a lever 2I1 fulcrumed on a stud 2I8 which mayproject from the housing I88. Said lever 2I1 will thereby have becomerocked to the Figure '7 position just as the clutch pawl arm I41 isabout to encounter the top of the clutchtrip arm I48. An arm 2I8 of saidthus rocked lever 2I1 engages a pin 228 on an extension of the arm I14which is fastened to the rock shaft I15 and the latter will thereby berocked counter-clockwise to the Figure '1 position and cause the rockshaft arm I18 to draw the switch control bar forwardly by means of thespring 18, thereby opening the switch contact 81, 88 for stopping themotor. a

The counter-clockwise rocking of the shaft I15 by means of the lever2I1. also lifts the arm I14 from the step I11 of the arm I88 so that thelatter urged clockwise by the spring I18 is restored with its step I12under the tab I18 of said arm I14. It will be obvious that saidcounter-clockwise rocking of the shaft I15 also withdraws the latch hookI81 from the tab I88 of the link I85 connected to the key lever I51, andthe latter thus becomes free to be restored by the-springs I8I, I84. Therestoration of the latch step I12 under tab I 18 serves, independentlyof the key lever controlled tab I88, to hold the lever I14, I81 and itsshaft I18 in restored position so that. if and while the key lever I81should be kept depressed manually, after pin 2I8 has engaged andreleased lever 2", it will be impossible. nevertheless, to cause theshaft I18 to be rocked to motor-switch-closing position again.

The tab I82 oi the lever I88 escapes from the hook I8I during thedepression of the key lever I81, as hereinbefore explained, for thepurpose of permitting said lever I88 to be rocked back to normalposition, Figure 7, after the clutch pawl arm I41 has passed the clutchtrip arm I48 during the first part of the. revolution of the gear I28.The arm, I88 of said lever I88 has a pin-and-slot connection Hi to thelink I81 connected to the lever I88, I88 so that said lever may remainin the Figure 6 position while the lever I88 is thus restored.

The gear I20 completes its cycle of revolution by turning slightlyfurther from the Figure 7 position, and therefore the clutch pawl I48,inasmuch asits arm I41 abuts the clutch trip arm I48, is caused to bewithdrawn from the worm wheel clutch teeth I48. The gear I28 finallystops and will have made a complete revolution when the clutch pawl I48encounters a stop 228 in the clutch pawl carrying plate I48. At such endof the revolution of the gear I28, its pin 2I8 will have passed the camnose 2I8 of the lever 2" so that the latter urged by the spring I84turns counter-clockwise to the normal Figure position again and, in saidposition, a hook 224 of the lever 2I1 may engage the pin 2I5 to preventrotation of the gear I28 in a direction contrary to its motor drivenrotation. It will be apparent that said hook 224, clutch trip arm I48and the clutch pawl stop 228 cooperate to lock the gear I28 againstrotation in either direction when the parts are in the normal Figure 5positions.

The arms 2I8, 2I8 of the lever 2" may be spaced apart laterally on thefulcrum stud 2I8 and be connected by a yoke 225. When the gear pin 2I5recedes, as in Figure 6, from the camnosed arm 2I8 of the lever 2, thelatter is stopped, by a pin 228 on the housing I38, to limit its returnby the spring I84, which may be connected between the levers I68, 2", asin Figure 6.

The platen driving gear I2I on the carriage 28 may be of the samediameter as the motor driven gear I28 on the frame of the machine. Whenthe carriage is in fully returned position, the two gears I28, I2I areto be in mesh so that the gear I28 during its motor driven revolutionwill drive the gear I 2| for a form-feeding cycle or completerevolution. The gear I2I travels with the carriage in letter feed andreturn directions. To look the carriage during the cycles of the gearsI28, I2I, the following means are provided.

Extending rearwardly from a pivotal connection 228 to the arm I88,Figure 5, is a bar 229 having an upright portion 288 opposite a bar 23Isecured to the carriage frame 28 by screws 232. When the carriage isfully returned, and the form-feed key lever I51 is depressed, the latteroperates through the link I85 and said arm I88 to draw said bar 229forwardly from the Figure 5 to the Figure 6 position to place saidupright portion 280 before a-lateral edge 288 on the carriage bar 28I.Said portion 288 thus conlatched in depressed position by means of thelatch hook I81 prevents leftward movement of the carriage from its fullyreturned position during a form-feeding cycle. The rear end of said bar228 may have a slot 284 for slidable support on a stud 288 in thehousing.

Mechanism, on the carriage, associated with the platen driving gear I2I,and operative as the latter is driven by cycling the power gear I28,will now be described.

The gear I2I has a hub 281 and withthe latter is rotatably loose on thelaten axle 88. Said gear I2I and its huh I are retained laterallybetween the right end of the platen axle sleeve 88 and the right handcarriage end plate 81, Figure l3. Pivoted at 288 to the left side of thegear I2I is a dog 288 presenting a laterally extending lug 248. A spring2 holds said dog 288 against a dog-backing step 242 on said gear I2I,said spring being anchored to said gear at 248. s

By means of said lug 248, the gear I2I may engage a lateral lug 244 ofan arm 248 fixed to the platen axle sleeve 88 by a set screw 248 in ahub 241 of said arm. With the parts in normal positions preparatory totyping the first line of a bill form 28, the front of the platen lug 244abuts the back of the lug 248 on the gear I2I, as in Figure 8.

Line spacing rotations of the platen 21 during the typing of the billform 28 cause the platen lug 244 to rotate away from the back of thegear lug 240 as is exemplified by the relative positions of said lugs inFigures 1 and 3. The

extent that the platen lug 244 is thus rotated away from the gear lug248 varies according to the number of lines a typed on the bill. It willbe obvious, now, that when the platen gear I is driven one revolution bythe power gear I28, it may turn idly on the platen axle 88 until its lug240 picks up the platen lug 244, and it will then, for the remainder ofits revolution, rotate the platen to bring the first-line-place of thesucceeding bill form 28 to typing position.

A set screw 248 in a hub 288 of a cam disk 28I secures the latterrigidly to the hub 281 of the platen gear III. In the normal position ofsaid gear I2I and its lug 248, a detent roll 282 of an arm 253 rests,under pressure of an arm spring 284, in a detent notch 288 of said camdisk. Said arm 288 is fixed to a transverse rock shaft 288 journaled inthe carriage frame 28. The platen gear I2 I and its lug 248 are thusdetented against rotative displacement from their normal position whilesaid gear I2I is unmeshed from the power gear I28 during the travel ofthe carriage. At the start of rotation, counter-clockwise of Figure 17,of the platen gear I2I and its cam disk 28I, for a form-feedingoperation, the detent roll 282 is forced out of the detent notch 255thereby rocking the shaft 258 clockwise of Figure 17. A cam arm 251fixed to the left end of said shaft 288 acts, when the latter is thusrocked, to withdraw the line space detent arm 88 from the line spacingwheel 81 for free rotation of the platen in form feeding. At thecompletion of the form feeding rotation of the platen gear I2I and itsdisk 28I, the gear detenting arm 288 reenters the detent notch 288 andits roll 252 then confronts a shoulder forming side 288 of the notch toprevent rotation of the platen gear I2I in clockwise direction of Figure1'7. As the detent arm roll 252 thus reenters the detent notch 255, thecam arm 281 is, of course, withdrawn from the line space detent arm 88so that the fronting said bar 28I when the key lever I "is latter,pressed by its spring 288, reengages the line space wheel 91. While thedetent roll 252 is out of the detent notch 255, it rides on the camcontour 286 of the disk 25L overthrow of the platen at the conclusion ofits form-feeding rotation by the gear I2| is prevented by the followingmeans.

A yoke 262 laterally spaces an overthrow-stoparm 263 from a control arm264. Said arms 263, 264 are loosely fulcrumed on and extend forwardlyfrom the rock shaft 256 and are retained laterally by upstanding ears265 of a plate 266 adjustably secured as at 261 to the carriage frame29. At the normal position of the gear I2I and its lug 246, a roller 268of the control arm 264 rests in an angle 269 at the top of a normallyupstanding arm 216 which, with its hub 21I, is rotatably loose on thehub 231 of the gear I2I. Said hub and arm are retained laterally betweenthe right side of said gear |2I and the hub 256 of the cam disk 25I,Figure 13.

With its control arm 264 thus positioned, the forward stop end of theoverthrow stop arm 263 stands above and thus clear of the platen lug 244and therefore normally permits the platen to be rotated freely in linespacing direction.

Attached to a stud 212 in the arm hub 21| and passing around the latterin a groove 213, Figure 4, to extend to an anchor 214, Figure 17, on thecarriage frame 29 is a helical spring 215 tending to turn said arm 216clockwise of Figures 1 and 17.

At a suitable point in the form-feeding revolution of the gear I2I, apawl 211, pivoted at 218 to the side of said gear I2| and pressed by aspring 219, engages a side 286 of a notch 28I, Figure 4, formed in theend of the hub 21E of the arm 216 so that further revolution of saidgear |2| rotates said arm 216 counter-clockwise to permit the controlarm 264, pressed by a spring 282 anchored to the plate 266, to drop andthereby drop the overthrow stop arm 263 into position, Figure '7, forintercepting the platen lug 244. The drop of the control arm 264 may belimited by abutment of its roller 268 with the hub rim of the rotatedarm 216 as in Figures and 16.

As the arm 216 is thus rotated, it winds the spring 215 around its hub21| and thereby increasingly tensions said spring. Near the end of therevolution of the platen driving gear |2I, when its lug 246 has driventhe platen lug 244 almost to the effectively positioned overthrow stoparm 263, a tall 283 of the pawl 211 encountersa stop 284 on the plate266 as in Figure '7. Thus, when the gear completes its form-feedingrevolution from the Figure 7 position, the pawl 211 is caused to turnclockwise about its pivot 218 to withdraw from its engagement at 286with the hub 2" of the arm 216 as in Figure 7. It results that said arm216 is freed, and is rotated clockwise, by the tensioned spring 215,back to its normal upright position, Figure 17, thereby camming andlifting the control arm 264 to raise the overthrow stop arm 263 clearagain of the platen lug 244.

But, before it is thus raised, said overthrow stop arm 263 will haveserved to engage the platen lug 244 to prevent overthrow of the platen,because, as will be obvious, the pawl 211 may become turned justsufliciently to release the arm 216 at substantially the instant, orslightly before, the platen lug 244 encounters said stop arm 263. Atthis time, also, the spring-pressed-detent roll snaps back into thedetent notch 255 associated with the gear I2 I, and concomitantly thespring-pressed line-space detent arm 33 snaps into reengagement with theline space wheel 91 to finally position the gear |2| and platen 21 sothat their respective lugs 246, 244 back slightly away, say, above flvethousandths of an inch from the overthrow stop arm 263, and thus let upon said stop arm so that restoration of the latter by means of the camor arm 216 and its spring 215 is facilitated. The clockwise rotation orrestoration of said arm 216 by the spring 215 is stopped when its angle268 reengages the control arm roll 266 as at Figure 17.

With the overthrow stop arm 253 thus restored to normal position at theend of a form-feeding cycle of the platen gear |2|, the platen 21, withits lug 244, again becomes free to be rotated in line spacing direction.

It is also desired that the platen 21' and its lug 244 be unlimitedlyrotatable in line spacing direction independently of the lug 246 of thegear |2|, and it is for this reason that said lug 246 is embodied in thespring-pressed pivoted dog 239 topermit said platen lug 244, whenturning in line spacing direction, to pass the gear lug 246. Said platenmay have the usual finger knobs 216.

For preventing simultaneous operation of the form-feed key lever I51 andrelease or rearward movement of the carriage return mechanism trip link54, the following mechanism is provided.

When said key lever I51 is depressed, a stud 285 thereon opposes, as inFigure 6, an edge 288 of an arm 281 fixed to a transverse rock shaft 288journaled in the machine frame. Counterclockwise rotation of said shaft268 is thus blocked and in turn said rock shaft, by means of an arm 289fixed thereon and opposing a pin 296 in said trip link 54, blocksrearward movement of said trip link. Conversely, when said trip link 54alone has been moved rearwardly for effecting a carriage returnoperation, its pin 296, engaging said arrn 289, has rocked said shaft288 counter-clockwise so that the top of the arm 281 is under the stud285 of the key lever I51, as in Figure 18, to block depression of saidkey lever. A spring 29I acting on the arm 289 may restore said rockshaft 288 to and keep it in normal position in which said arm may abutthe pin 296 of the restored trip link.

The platen gear |2| and the mechanism associated therewith on thecarriage may be guarded by a top cover plate 292 resting on a flange293, Figure 5, of the right carriage end plate 31, to which said plateis secured by a cap 294, Figure 3, and screws 295. A slotted stud 296 inthe side of the web chute 43 cooperates to support said plate 292, as at298, Figure 2. Said guard plate 292 may be provided with a dependingfront apron 291. A similar guard, 292, 291 may be provisded at the leftside of the carriage, Figure The spring coupling 1|, Figures 8 and 9,between the motor shaft 5| and the input shaft 12 of the mechanism drivemay be constructed as follows.

A helical torsion spring 366 is secured at each end to a plug 36I whichmay have a flange 362 to abut the spring end. Only two or three turns ofeach spring end are secured to the companion plug as by solder 363, theplug extending into the spring beyond a shaft receiving bore or socket364 to present a flat 365 and a key slot 366. The flat 365 may be formedby the bottom of a cross slot 8 that cuts into the inner end of the bore364 so that said-flat may engage the corresponding flattened end 361 ofthe shaft 5| or 12 for interlock with the plug 30L The soldering orsecuring of the spring ends to the plugs 30| is done so that, whenfinished. an oblong key 308 is in place, as at Figure 9, with the endsof the key inserted in the key slots 303 of the plugs 30 I. The keyengaging sides or faces of the key slot 306 may flare outwardly from theaxis of the key, asst 303, Figure 9, so that there is rotative playbetween the key and key slots, whereby one plug 30I may rotate limitedlyrelatively to the other plug. The possible twist, indicated by thearrows, Figure 9, which the spring undergoes as the mechanism isoperatedand whichreacts as hereinbefore described to open the carriage returnclutch. and to cushion the mechanism is thus limited and durability ofthe spring is favored. It will also be seen that if e spring shouldtwist under the comparative heavy form-feeding load, such twist would belimited by means of said key 306. This construction also provides foradjusting the initial tension of the spring 300. This is done,preferably before the spring coupling H is put between the shafts BI,12, by pulling the spring ends apartso that the key 308 is free of atleast one of the plugs 30L One spring end is then turned one or morehalf turns relatively to the other spring end to adjust said initialtension and then the pulled apart spring ends are allowed to cometogether again so that the key 308, engaging both slots 306 of the plugsagain, holds the initial tension by limiting relative rotation of theplugs in the direction opposite to the arrows, Figure 9. The plug part,within the spring, that is not soldered to the latter may be suficientlysmaller in diameter than the inner diameter or bore of the spring sothat when the latter is twisted it does not bind said plug part. ItwilLbe obvious in Figure 9 that the spring 300 surrounds the key 308 andthus retains the latter diametrically.

Figure 19 shows a modified spring coupling I I One plug 30i' has asimple bore 304' to receive the shaft or 12 and is fixed to the shaft byset screws 3l0. The other plug 30l has a head 3 and cross slot 3i2therein that may slidably fit a tongue or tongues 313 of a collar 3"fixed to the shaft by set screws 3l5. The slot-andtongue connection 312,3l3 permits the head 3 to move along the shaft to permit expansion andcontraction of the twisting or untwisting spring 300' which may besoldered at its ends to the plugs as in the hereinbefore describedcoupling. A cylindrical sleeve 3l6 loosely fits over reduced portions3I'i of. these plugs for support. Said portions 3H may have the radiallyflaring key slots 306' for the key 308'. Said sleeve retains said key308 diametrically. The periphery of the sleeve may also prevent or limitsinuous distortion of the spring 30I when the latter is twisted. The key308 may increase in thickness from its ends by means of the taper 3l3 toconduce to its strength and durability, and the key slots 306 may besimilarly tapered.

Variations may be resorted to within the scope of the invention andportions of'the improvements may be used without others.

What is claimed is: e

1. A form-feeding typewriter having, in combination, a frame, a carriagemovable laterally thereon, a-revoluble platen in the carriage, a gearmounted on the frame, power mechanism operable to cyclev said gear, aplaten rotating gear mounted on the carriage and movable laterallytherewith into and out of mesh with said power operable gear, and meanscontrolled by the carriage for. preventing operation of said powermechanism when said carriage has been moved from a position wherein saidgears are properly in mesh.

2. A form-feeding typewriter having, in combination, a frame, a carriagemovable laterally thereon, a revoluble platen in the carriage, a gearmounted on the frame, power mechanism operable to cycle said gear, meansto efiect operation of said power mechanism, a platen.rotating gearmounted on the carriage and movable laterally therewith into and out ofmesh with said power operable gear, means controlled by the carriage forpreventing operation of said powenmechanism when said carriage has beenmoved from a position wherein said gears are properly in mesh, and meanseffective-automatically in conJunotion with effecting operation of saidpower mechanism'to hold said carriage against lateral movement from theposition at which said gears are properly in mesh.

3. A form-feeding typewriter having; in combination, a frame, a carriagemovable laterally thereon, a revoluble platen inthe carriage, a gearmounted on the frame, power mechanism operable to cycle said gear, aplaten rotating gear mounted on the carriage and movable laterallytherewith into and out of mesh with said power operable gear, saidplaten gear having a one-way driving connection to said platen arrangedto permit said platen to be rotated in line spacing directionindependently of and relatively to said platen gear, said connectionleaving said platen gear rotatably free when said platen gear is out ofmesh with the cycling gear, and means detenting said platen gearangularly in a normal position relatively to said cycling gear wherebyto prevent the free rotation of the platen gear; while said gears areoutof mesh.

4. A form-feeding mechanism for a typing: machine, including, incombinatioma revoluble paper-roller, an engageable stop connected tosaid paper roller, a driver forsaid roller, av stop movable from anineifectiveto an efiective position for engaging said engageable stopfor limiting form-feeding rotation of said paper-roller by said driver,and stop-moving mechanism primarily controlled by the movement of saiddriver in form-feeding direction, so as to move said movable stop toeffective position to limit said rotation, and finally controlled, bythe. movement of said driver in said form-feeding direction, so as toeffect restoration of saidmovable stop to ineffective position.

5. In a typing machine, a form-feeding paper roller, a stop connected tosaid roller, a driver for said roller, a stop movable from ineffectiveto efiective position for engaging said first stop for limiting formfeeding rota'tion'of said paper roller by said driver, a movable camnormally positioned to keep said movable stop in ineffective position, apawl connection enabling said driver to pick up and move said cam tocause said stop to move to effective position, means effectivesubstantially concurrently with the arrest of the paper roller by theeffectively positioned stop to engage and trip said pawl connection torelease said cam, and a spring acting to return the released cam tonormal position to cause said stop to be restored to ineffectiveposition. I 1

6. In a typing machine, a form-feeding .paper roller, a stop connectedto said roller, .'a .,'dr,iv.er for said roller, a stop movable fromineffectiveto effective position for engaging said first stop for paperroller by the effectively positioned stop to engage and trip said pawlconnection to release said cam, a spring acting to return the releasedcam to normal position to cause said stop to be restored to ineffectiveposition, and spring pressed detent means operatively connected to andcausing the paper roller, upon its arrest, to back up slightly to let upits pressure on said movable stop for facilitating the restoration ofsaid movable stop by said spring actuated cam.

7. A form-feeding mechanism for a typewriter including, in combination,a revoluble paper roller, 9. key, cycling mechanism trippable by saidkey to rotate said paper roller, a latch acting to maintain said key inoperated position, latch tripping means coacting with said cyclingmechanism, at the conclusion of the rotation of said paper roller bysaid cycling mechanism, to release said key, a typewriter memberoperable 'consonantly with typing between form feeding operations andmeans controlled by said key when latched to prevent operation of saidtypewriter member during form feeding.

8. A form-feeding mechanism for a typewriter including, in combination,a paper roller, anormally inactive electric motor, a motor controllertending to move from a normal position to a position effective to startsaid motor, a latch normally effective for restraining said controller,a key, a cycling clutch mechanism trippabie by said key to operativelyconnect said paper roller and motor for a form-feeding operation, aoneway connection enabling said key to release said controller from saidlatch to cause it to move to start said motor, and means actuated by themotor, through the tripped clutch mechanism at the conclusion of theform-feeding operation to restore said motor controller to said latch tothereby stop said motor, said one-way connection permitting saidcontroller to be restored independently of said key.

9. A form-feeding typing machine having, in combination, a carriage, apaper roller, a normally inactive motor, means, including a normallyopen clutch, forming a carriage return connection between said motor andcarriage, means tending, through the rotation of said motor, to closesaid clutch, carriage retum starting means operable to start said motor,form-feed starting means, including a motor-starting member and aclutch, operable, respectively, to cause said motor to start and saidpaper roller to be connected to said motor for a form-feeding operation,and means correlated to at least one of said starting means so as to beeffective to restrain the closing of said carriage return clutch by therotation of said motor when said motor rotates said paper roller, and tobe ineffective when said motor is actuated by said carriage returnstarting means. I

10. In a typing machine; a, carriage, a paper roller, a normallyinactive motor, an element movable to an effective position to startsaid motor, a clutch closeable to connect said carriage and motor, acarriage return starter, means responsive to rotation of said motor toclose said clutch, a form-feeding starter and means responsive theretoto connect said paper roller to said motor, said element beingoperatively connected to both the carriage-retum starter and theformfeedlng starter so as to be movable by either starter independentlyof the other, and means correlated to at least one of said starters topreent said motor from closing the carriage return clutch when saidmotor operates in response to said form-feeding starter.

11. In a typing machine; power operable carriage return mechanism, apower operable form feeding mechanism, a normally inactive motor, aclutch closeable to connect said carriage return mechanism to saidmotor, a carriage return starter operable to start said motor, meanstending, through the rotation of said motor, to close said clutch, meansoperable Jointly to connect said form-feeding mechanism to said motorand to effect starting of said motor, means normally effective torestrain said clutch closing means, whereby said motor may be operableindependently of said carriage return mechanism to actuate saidform-feeding mechanism, and means responsive to operation of saidcarriage return starter to render said restraining means ineffective.

12. m a typing machine having a frame, a typing carriage thereon and aform feeding paper roller in said carriage; form feeding mechanismincluding a gear on said carriage for driving said paper roller, saidgear having a driving connection to said roller permitting said rollerto be rotated independently, a gear mounted on said power rotatabledriver mounted on said frame,

a trip element normally keeping said pawl disengaged from said driver,said trip element being retractable to release said pawl whereupon saiddriver rotates said frame gear and pawl. said trip element beingrestorable to encounter and disengage said pawl from said driver at theend of one revolution of said frame gear, a stop, rotatable with saidframe gear, to limit positively the disengaging movement of said pawleffected by means of said restored trip element, whereby said stop, pawland trip element cooperate to prevent positively overthrow of said framegear, and a rebound check for said frame gear.

13. In a typing machine; a carriage, a paper roller, a motor, a clutchnormally in open position and closeable to connect said carriage to saidmotor for a carriage return operation, a formfeedlng key movable tooperated position and tending to return therefrom, cycling mechanismoperable by said motor in response to operation of said key to drivesaid roller, means conditioned by said key in its operated position tolock said clutch in open position, a latch automatically effective tohold said key in operated position, and means actuated by said cyclingmechanism near the end of the cycle to trip said latch for consequentreturn of said key and restoration of said locking means to free saidclutch.

14. In a typing machine; a carriage, a paper roller, a motor, a carriagereturn mechanism, including a shiftable starter, to cause said motor toreturn said carriage, form feeding mechanism, including a depressiblekey lever, to cause said motor to drive saidroller, and interlockingmeans to prevent simultaneous operation of said carriage return starterand key lever, said interlocking means including a rock shaft, an armthereon, a lateral projection on the key lever to oppose said arm onlywhen said key lever is depressed, a second arm on said rock shaft, alateral projection on said carriage return starter opposed by saidsecond arm only when said key lever is depressed, said lateralprojection on said carriage return starter engaging said second arm .torock said shaft to move said first arm under the projection on said keylever to prevent depression of the latter when said carriage returnstarter is shifted.

15. In a typing machine having a frame and a laterally movable carriagethereon, the combination of a paper-feed operator on said carriage,power operable cycling mechanism on said frame engageable with saidoperator by placing said carriage at a predetermined position, a membertending to move from a normal position to an operated position todetermine an operation of said cycling mechanism, a retractable latchnormally positioned to restrain said member, a formfeed-initiating keymovable to an operated position, means conditioned by said key in itsoperated position to prevent movement of said carriage from its saidpredetermined position, an operative connection whereby said key, by itsmovement to operated position, retracts said latch from said member forresulting movement of the latter to its operated position and finallyleaves said latch free, said freed latch tending to return to its normalposition, and means coordinated with said cycling mechanism to restoresaid member to said freed latch consonantly with completing a cycle.

16. In a. typing machine having a frame and a laterally movable carriagethereon, the combination of a paper-feed operator on said carriage,power operable cycling mechanism on said frame engageable with saidoperator by placingsaid carriage at a predetermined position, a membertending to move from a normal position to an operated position todetermine an operation of said cycling mechanism, a retractable latchnormally positioned to restrain said member, a. form-feed-initiating keymovable to an operated position, means conditioned by said key in itsoperated position to prevent movement of said carriage from its saidpredetermined position, an operative connection whereby said key, by itsmovement to operated position, retracts said latch from said member forresulting movement of the latter to its operated position and finallyleaves said latch free, said freed latch tending to return to its normalposition, means coordinated with said cycling mechanism to restore saidmember to said freed latch consonantly with completing a cycle, said keytending to return from operated position, and means enabling said memberso long as it is in its operated position to hold said key in operatedposition.

MILES H. MANN.

